package com.bocai.grainshop.sreach.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.bocai.common.to.es.SkuEsModel;
import com.bocai.common.utils.R;
import com.bocai.grainshop.sreach.config.ElasticsreachConfig;
import com.bocai.grainshop.sreach.constant.EsConstant;
import com.bocai.grainshop.sreach.feign.ProductFeignService;
import com.bocai.grainshop.sreach.service.SearchServiceByParam;
import com.bocai.grainshop.sreach.vo.AttrResponseVo;
import com.bocai.grainshop.sreach.vo.BrandVo;
import com.bocai.grainshop.sreach.vo.SearchParam;
import com.bocai.grainshop.sreach.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SearchServiceByParamImpl implements SearchServiceByParam {


    @Resource
    private RestHighLevelClient client;

    @Resource
    private ProductFeignService productFeignService;

    /**
     * @Author: SunJinbo
     * @Description  DSL检索
     * @Param [searchParam]
     * @return com.bocai.grainshop.sreach.vo.SearchResult
     * @Data Created in 2022/4/3 21:09
     */

    @Override
    public SearchResult search(SearchParam searchParam) {
        SearchResult result = null;
        //1.动态构建出查询的DSL语句  准备检索请求
        SearchRequest searchRequest = bulidSearchRequest(searchParam);
        //2.执行检索请求
        try {
            SearchResponse response = client.search(searchRequest, ElasticsreachConfig.COMMON_OPITONS);
            //3.分析响应数据
            result = bulidSearchResult(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * @Author: SunJinbo
     * @Description  构建检索请求
     * @Param []
     * @return org.elasticsearch.action.search.SearchRequest
     * @Data Created in 2022/4/3 21:15
     */
    private SearchRequest bulidSearchRequest(SearchParam searchParam) {
        //构架DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //查询 过滤
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //must模糊匹配
        if(StringUtils.hasText(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",searchParam.getKeyword()));
        }
        //filter 三级分类id
        if(searchParam.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",searchParam.getCatalog3Id()));
        }
        //按品牌id
        if(searchParam.getBrandId()!=null && searchParam.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",searchParam.getBrandId()));
        }
        //按照是否有库存查询
        if(searchParam.getHasStock()!=null){

            boolQuery.filter(QueryBuilders.termQuery("hasStock",searchParam.getHasStock() == 1));
        }
        //按照价格区间
        if(StringUtils.hasText(searchParam.getSkuPrice())){
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParam.getSkuPrice().split("_");
            if(s.length == 2){
                //说明价格是个区间
                rangeQuery.gte(s[0]).lte(s[1]);
                log.info("价格字符串{}"+s[0]);
            }else if(s.length == 1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        //按照所有指定的熟悉attr
        if(searchParam.getAttrs()!=null && searchParam.getAttrs().size()>0){
            for (String attr : searchParam.getAttrs()) {
                BoolQueryBuilder builder = QueryBuilders.boolQuery();
                //前台 数据 attrs=1_5寸：8寸&attrs=2_16G:8G
                //&attrs=16_Legion%20Y9000P%20IAH7Hxxxxxx
                String[] s = attr.trim().split("_");
                //检索的Id
                String attrId = s[0];
                builder.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                //判断是属性是否为数组
                if(s.length>2){
                    String[] attrValues = s[1].split(":");
                    builder.must(QueryBuilders.termQuery("attrs.attrValue",attrValues));
                }else {
                    builder.must(QueryBuilders.termQuery("attrs.attrValue",s[1]));
                }
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", builder, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //将所有条件进行封装
        sourceBuilder.query(boolQuery);

        //排序  sort=hotScore_asc/desc
        if(StringUtils.hasText(searchParam.getSort())){
            String[] s = searchParam.getSort().split("_");
            SortOrder order =  s[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        //分页
        if(searchParam.getPageNum()!=null && searchParam.getPageNum()!=0){

            sourceBuilder.from((searchParam.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
            sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        }

        //高亮
        if(StringUtils.hasText(searchParam.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        //聚合分析
        //1. 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //分类id聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        //子聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));

        sourceBuilder.aggregation(catalog_agg);
        //属性参数聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前的所有attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        attr_agg.subAggregation(attr_id_agg);
        //聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(1));
        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(50));

        sourceBuilder.aggregation(attr_agg);

        log.info("构建的DSL语句{}"+sourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }

    /**
     * @Author: SunJinbo
     * @Description  封装响应数据
     * @Param [response]
     * @return com.bocai.grainshop.sreach.vo.SearchResult
     * @Data Created in 2022/4/3 21:17
     */
    private SearchResult bulidSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();

        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        //遍历所有商品信息
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);

                //判断是否按关键字检索，若是就显示高亮，否则不显示
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    //拿到高亮信息显示标题
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String skuTitleValue = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(skuTitleValue);
                }
                esModels.add(esModel);
            }
        }
        result.setProduct(esModels);

        //2、当前商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        //获取属性信息的聚合
        ParsedNested attrsAgg = response.getAggregations().get("attr_agg");

        ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");

        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
                SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
                //1、得到属性的id
                long attrId = bucket.getKeyAsNumber().longValue();
                attrVo.setAttrId(attrId);

                //2、得到属性的名字
                ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
                String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
                attrVo.setAttrName(attrName);

                //3、得到属性的所有值
                ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
                List<String> attrValues = attrValueAgg.getBuckets().stream().map(MultiBucketsAggregation.Bucket::getKeyAsString).collect(Collectors.toList());
                attrVo.setAttrValue(attrValues);
                attrVos.add(attrVo);

            }

        result.setAttrs(attrVos);

        //3、当前商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        //获取到品牌的聚合
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //2、得到品牌的名字
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);

            //3、得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4、当前商品涉及到的所有分类信息
        //获取到分类的聚合
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }

        result.setCatalogs(catalogVos);
        //以上可以从聚合信息中获取

        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //5、1分页信息、总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //5、2分页信息-总页码-计算
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                (int) total / EsConstant.PRODUCT_PAGESIZE : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //TODO 全局requestURL
        String queryString = param.get_queryString();

        //6、构建面包屑导航
        List<SearchResult.NavVo> baseNavVo = new ArrayList<>();
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
                baseNavVo = param.getAttrs().stream().map(attr -> {
                //1、分析每一个attrs传过来的参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                Object code = r.get("code");
                String toJSONString = JSON.toJSONString(code);
                Integer num = JSON.parseObject(toJSONString, new TypeReference<Integer>() {
                });
                if(num == 0){

                    Object o = r.get("attr");
                    String string = JSON.toJSONString(o);
                    AttrResponseVo attrResponseVo = JSON.parseObject(string, new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(attrResponseVo.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }

                //2、取消了这个面包屑以后，我们要跳转到哪个地方，将请求的地址url里面的当前置空
                //拿到所有的查询条件，去掉当前
                    String replace = replaceQueryString(queryString, attr, "attrs");
                    navVo.setLink("http://sreach.grainshop.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(baseNavVo);

            log.info("开始{}"+result.getNavs().size());
        }


        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            R r = productFeignService.brandsInfo(param.getBrandId());

            Object code = r.get("code");
            String s = JSON.toJSONString(code);
            Integer num = JSON.parseObject(s, new TypeReference<Integer>() {
            });

            if(num == 0 ){
                Object o = r.get("brand");
                String toJSONString = JSON.toJSONString(o);
                List<BrandVo> brand = JSON.parseObject(toJSONString, new TypeReference<List<BrandVo>>() {
                });
                StringBuffer sb = new StringBuffer();
                String replace ="";
                for (BrandVo brandVo : brand) {
                    sb.append(brandVo.getName()+";");
                    replace = replaceQueryString(queryString, brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(sb.toString());
                navVo.setLink("http://sreach.grainshop.com/list.html?"+replace);
            }
                baseNavVo.add(navVo);

                result.setNavs(baseNavVo);

                log.info("最后{}"+result.getNavs().size());
        }


        return result;
    }

    private String replaceQueryString(String queryString, String value,String key) {
        String encode = null;

        try {
            encode = URLEncoder.encode(value,"UTF-8");
            encode = encode.replace("+","%20"); //浏览器差异
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        if(queryString.contains("&")){
            return queryString.replace("&"+key+"="+encode,"");
        }else {
            return queryString.replace(key+"="+encode,"");
        }
    }

}
